Table 4. Output 3.

Poisson regression				Number of obs = 237
				LR chi2(7) = 727.89
				Prob > chi2 = 0.0000
Log likelihood = -3514.5847				Pseudo R2 = 0.0938
articles	Coef.	Std. Err.	z	P>|z|	[95% Conf. Interval]
1.male	.2610042	.0275592	9.47	0.000	.2069891	.3150192
discid
1	.0908272	.0263816	3.44	0.001	.0391202	.1425342
2	.1944639	.0278842	6.97	0.000	.1398119	.249116
countryid
1	.4872713	.0270886	17.99	0.000	.4341786	.5403641
2	.2603595	.0350321	7.43	0.000	.1916978	.3290212
yeardeg	.0139618	.001387	10.07	0.000	.0112433	.0166803
_cons	-24.63855	2.75371	-8.95	0.000	-30.03572	-19.24138